Engine - Belt Noise/Wear Condition

89chevy08

Number: 89-61-6B

Section: 6B

Date: JAN., 1989

Subject: BELT NOISE/WEAR


Model and Year: 1988-89 C3, K3, AND R2 WITH 7.4L (VIN CODE N) ENGINE



TO: ALL CHEVROLET DEALERS


Some C, K, and R trucks with 7.4L engine and serpentine belt system may have a belt noise/wear condition. This condition could be caused by a misaligned serpentine belt system. In a properly aligned system, the belt should be close to the center of the tensioner pulley, and the pulley should extend past belt edge both front and rear.

If tensioner runs rearward of belt center, add 1/16" washer (reference P/N 120394) behind inboard rear leg of generator bracket and cylinder head (see illustration). Rotate engine to verify alignment. In cases of severe misalignment where pulley contacts 2/3 of the belt width, 1/8" thick front end suspension shim may be installed instead of the washer at the same location.

Parts are currently available from GMSPO.

Labor Operation Number: T7850

Labor Time : .4 Hours